Distributor rotor



May 5, 1964 E. KOHLER DISTRIBUTOR ROTOR Filed Nov. 17, 1959 FIG? //vVENTOR iP/VSF #01745 R ATTORNEY United States Patent Office 3,132,219 IDISTRIBUTOR ROTOR Ernst Kohler, Hofingen, Kreis Leonberg, Germany,assignor to -Robert Bosch G.m.b.H., Stuttgart, Germany Filed Nov. 17,1959, Ser. No. 853,604 Claims priority, application Germany Nov. 19,1958 5 Claims. (Cl. 200-19) The present invention relates to ignitiondistributors for internal combustion engines, and more particularly to adistributor rotor of insulating material with built-incurrent-conducting parts.

The current-conducting parts of presently utilized rotors for ignitionsystems of internal combustion engines consist of a contact member whichis conductively connected with and supplies high-voltage current to arevolving distributor electrode, and in some instances also comprise asuppressor resistance which is inserted between the contact member andthe revolving electrode. At least the contact member and the electrodeare molded into the material of the insulating rotor body which normallyconsists of Bakelite. The suppressor resistance is inserted between thecontact member and the distributor electrode in a subsequent. step. Inpresently known distributor rotors which operate without a resistance,the distributor electrode and the contact member form an integralassembly whichisfmolded into the insulating material of the runner body.

In all such prior constructions, the insertion of metalliccurrent-conducting parts into the molds before the latter are filledwith a'hardenable plastic insulating material is connected with a seriesof difiiculties, is also very timeconsuming, and hence considerablyincreases the manufacturing cost of the distributors. r

An important object of'the present invention is to provideanimprovedrunnenor rotor" for the ignition distributors of internalcombustion engines which may be manufactured at a reduced cost'and'which can be assembled in a very simple and economical way.

Another object of the invention is to provide a method of assembling thenovel rotor according to which the rotor may be assembled in a singlestep from two prefabricated components.

With the above objects in view, the invention resides in the provisionof a distributor rotor for the ignition systems of internal combustionengines in which the prefabricated one-piece current-conductingcomponent is inserted into a suitably shaped recess of the prefabricatedone-piece insulating component and is thereupon anchored in the latterby a hardenable plastic substance. The insulating component may consistof pressed Bakelite which is formed with a recess adapted to receive theprefabricated current-conducting component, and the recess is thereuponfilled with a hardenable casting resin or the like which latter expelsair from the recess and, after hardening, anchors the current-conductingcomponent in the insulating component.

The novel features which are considered as characteristic for theinvention are set forth in particular in the appended claims. Theinvention itself, however, both as to its construction and its method ofoperation, together i with additional objects and advantages thereof,will be best understood from the following detailed description of aspecific embodiment when read in connection with the accompanyingdrawing, in which:

FIG. 1 illustrates in perspective view the prefabricated one-piececurrent-conducting component of the distributor rotor;

FIG. 2 is perspective view of the prefabricated onepiece insulatingcomponent; and

FIG. 3 is partly elevational and partly sectional view of the fullyassembled rotor.

Referring now in greater detail to the drawing, and

first to FIG. 1, there is shown a current-conducting comj ponent A whichcomprises an elongated rod-like suppressor resistance 10 consisting of ametallic oxide and carrying at each of its ends a connecting cap 11. Thecaps 11 are fixed to a pair of lugs 12', 13' and these lugs, in turn,are electrically connected with a circularcontact plate 12 and adistributor electrode 13, respectively. The

component B whose body member 14 is of slightly conical shape andcarries at its front, i.e. larger-diameter end a substantially flatradial extension or arm 14a. The exposed surface of extension 14a at thefront end of the" insulating component B is formed with a groove 15whose depth and length are selected in such a way that the groove,

may receive the resistance 10 together with the caps 11 and lugs 12,13'. The exposed surface at the front end of the body member 14 isformed with a rounded depression 16 for the contact plate or member 12,and asecond depression 17 is formed at the free end of extension 14a forthe electrode 13. The groove 15 and the depressions 16, 17 constitute acomposite recess for reception of the current-conducting component A.

The fully assembled rotor R is shown in FIG. 3. In accordance with mymethod, the current-conducting component A is inserted into thecomposite recess 1517 in the insulating component B, and the recess isthereupon filled with a hardenable synthetic plastic substance 22,

temperature of components A, B may be in the range of about C.

Without further analysis, the foregoing will so fully reveal the gist ofthe present invention that others can, by applying current knowledge,readily adapt it for various applications without omitting featuresthat, from the standpoint of prior art, fairly constitute essentialcharacteristics of the generic and specific aspects of this inventionand, therefore, such adaptations should and are intended to becomprehended within the meaning and range of equivalence of thefollowing claims.

What is claimed as new and desired to be secured by Letters Patent is:

1. In the ignition distributor of an internal combustion engine, a rotorcomprising, in combination: an insulating component having a front endand a recess in said end; a prefabricated one-piece current-conductingcomponent received in a portion of said recess and including a contactmember connectable towa source of electric current and a distributorelectrode conductively connected with the contact member; and a hardenedresin airtightly filling the remainder of said recess and anchoring thecurrent conducting component in the insulating component, said resinforming an airtight seal about a portion of said ourrent-conductingcomponent.

2. In the ignition distributor of an internal combustion engine, a rotorcomprising, in combination: a one-piece Patented May 5, 1964 insulatingcomponent having a front end and a recess in said end; a prefabricated0116131666 current-conducting component received in a portion of saidrecess and comprising a contact member connectable to a source ofelectrical energy, a resistance conductive-1y connected with the contactmember, and a distributor electrode conductively connected with theresistance; and a hard plastic substance receivedin and airtightlyfilling the remainder of said recess and constituting the sole means foranchoring the current-conducting component in the insulating component,said plastic substance forming an airtight seal around saidresistance.

3. In the ignition distributor of an internal'combustion engine, a rotorcomprising, in combination: an insulating component having a front endand a recess in said end; a prefabricated. one-piece current-conductingcomponent' received in a portion of said recess and comprising arod-like suppressor resistance having two ends and a contact cap fixedto each of its ends, a ing fixed to each of said caps, a contact memberconnectable to a source of electrical energy sand fixed'to one of saidlugs, and a distributor electrode fixed to the other lug; and a hardplastic substance received in an airtightly filling the remainder ofsaid recess and constituting the sole means for anchoring thecurrent-conducting component in the insulating component, said plasticsubstance forming an airtight seal about said resistance.

4. In the ignitiondistributorof an internal combustion engine, a rotorcomprising, in combination: an insulating component consisting of aconical body memberhaving a larger-diameter front end and a radial armextending ,from the body member at said front end, said arm having afree end formed with a first depression and also having a groovecommunicating with said depression and extendingtoward said body member,and the body member having a second depression communicating with saidgroove, said groove and said depression constituting a composite recessat the front end of said insulating component; a prefabricated one-piececurrent-conductingcomponent comprising a resistance received in saidgroove, a distributor electrode conductively connected with theresistance and received in said first depression, and a contact memberconnectable to a source of electric current, received in said seconddepression, and conductively connected with said resistance, saidcurrent-conducting component filling a portion of said recess; and ahard synthetic plastic substance received in and airtightly filling theremainder of said recess and constituting the sole means for anchoringthe current-conducting component in the insulating component, saidplastic substance forming an airtight seal about said resistance. 7

5. In the ignition distributor of an internal combustion engine, a rotorcomprising, in combination: an insulating component consisting of aconical body member having a larger-diameter front end and a radial armextending from the body'mernber of said front end, said arm having afree end formed with a first depression and also having ,a groovecommunicating with said depression and extending toward said bodymember, and the body member having a rounded second depressioncommunicating with 7 said groove, said groove and said depressionsconstituting a composite recess at the front end of said insulatingcomponent; a prefabricated one-piece current-conducting componentcomprising an elongated resistance received in said groove, adistributor electrode conductively connected with the resistance andreceived in said first depression, and a circular contact plateconnectable to a source of electric current, received in said seconddepression, and conductively connected with said resistance, saidcurrent-conducting component filling a portion of said recess; and ahard synthetic plastic s bstance received in and aintightiy filling theremainder of said recess and constituting the sole means for anchoringthe current-conductingcomponent in the insulating component, saidsubstance sealing said resistance from the atmosphere.

References Cited in the file of this patent UNITED STATES PATENTS RedickMar. 25, 1958

1. IN THE IGNITION DISTRIBUTOR OF AN INTERNAL COMBUSTION ENGINE, A ROTORCOMPRISING, IN COMBINATION: AN INSULATING COMPONENT HAVING A FRONT ENDAND A RECESS IN SAID END; A PREFABRICATED ONE-PIECE CURRENT-CONDUCTINGCOMPONENT RECEIVED IN A PORTION OF SAID RECESS AND INCLUDING A CONTACTMEMBER; AND A HARDENED RESIN AIRTIGHTLY FILLING THE REMAINDER OF SAIDRECESS AND ANCHORING THE CURRENTCONDUCTING COMPONENT IN THE INSULATINGCOMPONENT, SAID RESIN FORMING AN AIRTIGHT SEAL ABOUT A PORTION OF SAIDCURRENT-CONDUCTING COMPONENT.